linux-kernel - [PATCH 2/9] irqchip/loongson-pch-pic: Improve edge triggered interrupt support

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Message-Id: <20210706030904.1411775-3-chenhuacai@loongson.cn>
Date:   Tue,  6 Jul 2021 11:08:57 +0800
From:   Huacai Chen <chenhuacai@...ngson.cn>
To:     Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <maz@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
        Huacai Chen <chenhuacai@...il.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Chen Zhu <zhuchen@...ngson.cn>
Subject: [PATCH 2/9] irqchip/loongson-pch-pic: Improve edge triggered interrupt support

Edge-triggered mode and level-triggered mode need different handlers,
and edge-triggered mode need a specific ack operation. So improve it.

Signed-off-by: Chen Zhu <zhuchen@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 drivers/irqchip/irq-loongson-pch-pic.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
index f790ca6d78aa..a4eb8a2181c7 100644
--- a/drivers/irqchip/irq-loongson-pch-pic.c
+++ b/drivers/irqchip/irq-loongson-pch-pic.c
@@ -92,18 +92,22 @@ static int pch_pic_set_type(struct irq_data *d, unsigned int type)
 	case IRQ_TYPE_EDGE_RISING:
 		pch_pic_bitset(priv, PCH_PIC_EDGE, d->hwirq);
 		pch_pic_bitclr(priv, PCH_PIC_POL, d->hwirq);
+		irq_set_handler_locked(d, handle_edge_irq);
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		pch_pic_bitset(priv, PCH_PIC_EDGE, d->hwirq);
 		pch_pic_bitset(priv, PCH_PIC_POL, d->hwirq);
+		irq_set_handler_locked(d, handle_edge_irq);
 		break;
 	case IRQ_TYPE_LEVEL_HIGH:
 		pch_pic_bitclr(priv, PCH_PIC_EDGE, d->hwirq);
 		pch_pic_bitclr(priv, PCH_PIC_POL, d->hwirq);
+		irq_set_handler_locked(d, handle_level_irq);
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		pch_pic_bitclr(priv, PCH_PIC_EDGE, d->hwirq);
 		pch_pic_bitset(priv, PCH_PIC_POL, d->hwirq);
+		irq_set_handler_locked(d, handle_level_irq);
 		break;
 	default:
 		ret = -EINVAL;
@@ -113,11 +117,24 @@ static int pch_pic_set_type(struct irq_data *d, unsigned int type)
 	return ret;
 }
 
+static void pch_pic_ack_irq(struct irq_data *d)
+{
+	unsigned int reg;
+	struct pch_pic *priv = irq_data_get_irq_chip_data(d);
+
+	reg = readl(priv->base + PCH_PIC_EDGE + PIC_REG_IDX(d->hwirq) * 4);
+	if (reg & BIT(PIC_REG_BIT(d->hwirq))) {
+		writel(BIT(PIC_REG_BIT(d->hwirq)),
+			priv->base + PCH_PIC_CLR + PIC_REG_IDX(d->hwirq) * 4);
+	}
+	irq_chip_ack_parent(d);
+}
+
 static struct irq_chip pch_pic_irq_chip = {
 	.name			= "PCH PIC",
 	.irq_mask		= pch_pic_mask_irq,
 	.irq_unmask		= pch_pic_unmask_irq,
-	.irq_ack		= irq_chip_ack_parent,
+	.irq_ack		= pch_pic_ack_irq,
 	.irq_set_affinity	= irq_chip_set_affinity_parent,
 	.irq_set_type		= pch_pic_set_type,
 };
-- 
2.27.0